Bsi bs en 12583 2014

BS EN 12583:2014 BSI Standards Publication Gas Infrastructure — Compressor stations — Functional requirements BS EN 12583:2014 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 12583:2014 It supersedes BS EN 12583:2000 which is withdrawn The UK participation in its preparation was entrusted to Technical Committee GSE/33, Gas supply A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © The British Standards Institution 2014 Published by BSI Standards Limited 2014 ISBN 978 580 77934 ICS 23.140; 75.200 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2014 Amendments issued since publication Date Text affected BS EN 12583:2014 EN 12583 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM March 2014 ICS 23.140; 75.200 Supersedes EN 12583:2000 English Version Gas Infrastructure - Compressor stations - Functional requirements Infrastructures gazières - Stations de compression Prescriptions fonctionnelles Gasinfrastruktur - Verdichterstationen - Funktionale Anforderungen This European Standard was approved by CEN on 20 December 2013 CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 12583:2014 E BS EN 12583:2014 EN 12583:2014 (E) Contents Page Foreword Scope Normative references Terms and definitions Safety 13 Asset management and quality assurance 14 Environmental constraints 14 7.1 7.1.1 7.1.2 7.2 7.2.1 7.2.2 7.3 7.3.1 7.3.2 7.3.3 7.3.4 7.3.5 7.3.6 7.3.7 7.3.8 7.3.9 7.3.10 7.3.11 7.4 7.4.1 7.4.2 7.4.3 7.4.4 7.4.5 7.4.6 7.4.7 7.5 7.5.1 7.5.2 7.5.3 7.5.4 7.5.5 7.5.6 7.5.7 7.6 7.6.1 7.6.2 7.6.3 7.7 Design, construction and testing 14 General requirements for design 14 General 14 Safety and the environment 15 Location and station lay-out 15 Location 15 Station lay-out 16 Pipework 17 Design considerations 17 Valves 18 Gas cleaning 18 Gas coolers 18 Pressure reduction stations 18 Recycle line 18 Vent systems 18 Station isolation system 19 Corrosion protection 19 Services pipework 19 Standard colour code 19 Compressor unit 19 General 19 Driver 20 Compressor 21 Unit Control System (UCS) 22 Unit auxiliary equipment 25 Foundations 29 Compressor Unit Housing 29 Station Control and Automation 30 Station Control System (SCS) 30 Station emergency shutdown systems 30 Gas detection system 31 Fire protection system 31 Station valve control and supervision 31 Over-pressure protection system 31 Over-temperature protection system 32 Electrical installation and power supply 32 General 32 Electrical power supply 32 Electrical installation 32 General requirements for construction 32 BS EN 12583:2014 EN 12583:2014 (E) 7.7.1 7.7.2 7.7.3 7.8 7.8.1 7.8.2 7.8.3 7.8.4 7.8.5 7.8.6 General 32 Execution of work 33 Station pipework construction 33 Testing and acceptance 33 General requirements 33 Pre-commissioning 33 Commissioning 33 As built records of the station 34 Handover 34 Responsibility for safety 34 8.1 8.2 8.3 8.3.1 8.3.2 8.3.3 8.3.4 8.4 8.5 8.6 8.6.1 8.6.2 8.6.3 Operation 34 Introduction and basic requirements 34 Operating organization 35 Instruction procedures 35 General 35 Instructions for normal situations 35 Instructions for failure or emergency situations 36 Procedures for specific planned situations 36 Management of operating procedures 36 Training of personnel 37 Safety precautions 37 Prevention of gas explosion and fire 37 Storage of combustible materials 37 Venting 37 9.1 9.2 9.3 9.3.1 9.3.2 9.3.3 9.4 9.5 9.6 9.7 9.7.1 9.7.2 9.7.3 Maintenance 38 Introduction and basic requirements 38 Maintenance organization 38 Maintenance procedures 38 General 38 Gas compressor units 39 Pipework 39 Management of the maintenance procedures 39 Training of personnel 39 Maintenance tools and equipment 39 Safety 40 General 40 Safety precautions 40 Safety devices 40 10 10.1 10.2 Decommissioning and disposal 41 Decommissioning 41 Disposal 41 Annex A (informative) Boundary of a gas compressor station 42 Annex B (informative) Parts of a gas compressor unit 44 Annex C (informative) Boundary Gas compressor unit — Driver package 45 Annex D (informative) Boundary Gas compressor unit — Gas compressor 46 Annex E (informative) Boundary Gas compressor unit — Unit control system 47 Annex F (informative) Boundary Gas compressor unit — Auxiliary equipment 48 Annex G (informative) Significant technical changes between this European Standard and the previous edition 49 Bibliography 51 BS EN 12583:2014 EN 12583:2014 (E) Foreword This document (EN 12583:2014) has been prepared by Technical Committee CEN/TC 234 “Gas Infrastructure”, the secretariat of which is held by DIN This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2014, and conflicting national standards shall be withdrawn at the latest by September 2014 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights This document supersedes EN 12583:2000 This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association Annex G provides details of significant technical changes between this European Standard and the previous edition There is a complete suite of functional standards prepared by CEN/TC 234 "Gas infrastructure" to cover all parts of the gas infrastructure from the input of gas into the on-shore transmission network up to the inlet connection of gas appliances, including transmission, distribution, storage, compression, pressure regulation and metering, installation, injection of non-conventional gases, gas quality issues and others In preparing this standard a basic understanding of gas infrastructure by the user has been assumed The gas infrastructure is complex and the importance on safety of its construction and use has led to the development of very detailed codes of practice and operating manuals in the member countries These detailed statements embrace recognised standards of gas engineering and the specific requirements imposed by the legal structures of the member countries Directive 2009/73/EC concerning common rules for the internal market in natural gas and the related Regulation (EC) No 715/2009 on conditions for access to the natural gas transmission networks also aim at technical safety (security) including technical reliability of the European gas system These aspects are also in the scope of CEN/TC 234 standardisation In this respect CEN/TC 234 evaluated the indicated EU legislation and amended this technical standard accordingly, where required and appropriate In this edition of EN 12583 environmental aspects relevant to the design, construction and testing, operation and maintenance, decommissioning and disposal of compressor stations in the scope of this standard are covered in accordance with CEN Guide and CEN/TR 16388 This European Standard supersedes all other European Standards for gas compressor stations in the gas infrastructure above 16 bar and with a total shaft power over MW According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom BS EN 12583:2014 EN 12583:2014 (E) Scope This European Standard describes the specific functional requirements for the design, construction, operation, maintenance and disposal activities for safe and secure gas compressor stations This European Standard applies to new gas compressor stations with a Maximum Operating Pressure (MOP) over 16 bar and with a total shaft power over MW For existing compressor stations, this European Standard applies to new compressor units Where changes/modifications to existing installations take place, due account may be taken of the requirements of this European Standard This European Standard does not apply to gas compressor stations operating prior to the publication of this European Standard The purpose of this European Standard is intended to: — ensure the health and safety of the public and all site personnel, — to cover environmental issues and — to avoid incidental damage to nearby property This European Standard specifies common basic principles for the gas infrastructure Users of this European Standard should be aware that more detailed national standards and/or codes of practice may exist in the CEN member countries This European Standard is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this European Standard, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts) CEN/TR 13737 (all parts) gives: — clarification of all legislations/regulations applicable in a member state; — if appropriate, more restrictive national requirements; — a national contact point for the latest information This European Standard does not apply to: — off-shore gas compressor stations; — gas compressor stations for compressed natural gas filling-stations; — customer installations downstream of the point of custody transfer; — design and construction of driver packages (see Annex C) For supplies to utility services such as small central heating boilers reference should be made to EN 1775 Figure shows a schematic representation of compressor stations in a gas infrastructure BS EN 12583:2014 EN 12583:2014 (E) Key compressor station pig traps distribution system transmission line metering and/or pressure limiting or regulation station storage facility NOTE Parts indicated in frames by thick lines are within the scope of this European Standard (* part of pipeline but operated by SCS) Figure — Schematic representation of compressor stations in the gas infrastructure Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies EN 1012-3, Compressors and vacuum pumps — Safety requirements — Part 3: Process compressors EN 1594, Gas infrastructure — Pipelines for maximum operating pressure over 16 bar — Functional requirements EN 12186, Gas supply systems — Gas pressure regulating stations for transmission and distribution — Functional requirements EN 12732, Gas infrastructure — Welding steel pipework — Functional requirements BS EN 12583:2014 EN 12583:2014 (E) EN 14505, Cathodic protection of complex structures EN 60079-10-1, Explosive atmospheres — Part 10-1: Classification of areas — Explosive gas atmospheres (IEC 60079-10-1) EN 60079-20-1, Explosive atmospheres — Part 20-1: Material characteristics for gas and vapour classification — Test methods and data (IEC 60079-20-1) EN 61000-6-2, Electromagnetic compatibility (EMC) — Part 6-2: Generic standards — Immunity for industrial environments (IEC 61000-6-2) EN 61000-6-4, Electromagnetic compatibility (EMC) — Part 6-4: Generic standards — Emission standard for industrial environments (IEC 61000-6-4) EN 61508 (all parts), Functional safety of electrical/electronic/programmable electronic safety-related systems (IEC 61508 (all parts)) EN 61511 (all parts), Functional safety — Safety instrumented systems for the process industry sector (IEC 61511 (all parts)) EN ISO 10437, Petroleum, petrochemical and natural gas industries — Steam turbines — Special-purpose applications (ISO 10437) EN ISO 10439, Petroleum, chemical and gas service industries — Centrifugal compressors (ISO 10439) EN ISO 13849-1, Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design (ISO 13849-1) ISO 3977-1, Gas turbines — Procurement — Part 1: General introduction and definitions ISO 3977-2, Gas turbines — Procurement — Part 2: Standard reference conditions and ratings ISO 13707, Petroleum and natural gas industries — Reciprocating compressors Terms and definitions For the purposes of this document, the following terms and definitions apply 3.1 alarm signal provided to an operator which indicates the approach or the presence of an unwanted event 3.2 availability ability to be in a state to perform as and when required under given, assuming that the required external resources are provided Note to entry: This ability depends on the combined aspects of the reliability, the maintainability and recoverability of the item and the maintenance supportability Note to entry: Required external resources, other than maintenance resources, not affect the availability of the item although the item may not be available from the user’s viewpoint [SOURCE: EN 13306:2010, 4.1, modified − definition altered and original Note not quoted here] BS EN 12583:2014 EN 12583:2014 (E) 3.3 commissioning activities required to fill pipework, equipment and assemblies with gas for the first time and to perform test runs to check the system‘s integrity 3.4 compressor surge flow and/or pressure instability including reverse flow inside a compressor 3.5 compressor unit set of driver package, gas compressor, control system and their auxiliary equipment which includes unit valves and associated pipework to compress gas Note to entry: Boundary compressor unit / compressor, see Annex D 3.6 compressor unit building structure where one or more drivers with compressors and auxiliary equipment are installed Note to entry: Operation and maintenance are normally carried out inside the building Note to entry: (see Figure 2) Temporary partitions could be installed to isolate a compressor unit during maintenance 3.7 compressor unit housing structure to contain the compressor unit which can consist of compressor unit building, enclosure or a combination of both 3.8 control room room housing the control system from which the station personnel can, when necessary, take action on the process 3.9 decommissioning activities required to take out of service any pipework, stations, equipment or assemblies filled with gas and to disconnect them from the system 3.10 design pressure DP pressure on which design calculations are based 3.11 design temperature DT temperature on which design calculations are based 3.12 disposal activities to be performed after components of a decommissioned gas compressor station have been dismantled BS EN 12583:2014 EN 12583:2014 (E) 9.7 Safety 9.7.1 General No maintenance shall be carried out without the prior approval of the occupier The occupier shall give his approval for the work to be carried out when he is satisfied that it can be performed safely To ensure maximum safety, a permit to work should be issued by the authorized person It shall also be the responsibility of the personnel undertaking maintenance work to ensure that it is safe for the work to commence and that it is performed in a safe manner 9.7.2 Safety precautions During maintenance activities, the following shall be applied where appropriate: a) prevent gas from entering isolated equipment by appropriate devices i.e double block and bleed or spectacle plates (blank plate); b) prevent back flow to compressor units if a common downstream vent is utilized Specific precautions could be necessary where relief valves are part of the isolated equipment; c) prevent the driver from starting while maintenance work is in progress; d) isolate the power supply to any electric devices The equipment shall be returned into service in a safe and orderly manner Unless a specific permit to work is given or dedicated control of the atmosphere is taken, the following requirements shall be applied for work in hazardous areas: e) the use of sparking tools shall not be allowed unless the area is proven to be safe and gas-free; f) the use of torches, portable flood lights, extension leads and electrically powered tools or equipment unless they are certified for use in hazardous areas shall not be allowed; g) the operation of internal combustion engines that power trucks, cars, air compressors, pumps, generators and other maintenance equipment in hazardous atmospheres if not provided with special devices for such atmospheres shall not be allowed unless the area is proven to be safe and gas-free; h) welding or carrying out other works causing sparks shall not be allowed unless the area is proven to be safe and gas-free; In the above mentioned cases fire extinguishers should be provided 9.7.3 Safety devices Instrumentation and equipment associated with the safe operation of the station shall be regularly examined and maintained; also it should be subject to periodic tests to determine that it is: a) fit for purpose; b) functioning correctly at the required values; 40 BS EN 12583:2014 EN 12583:2014 (E) c) protected from any outside influence that might prevent proper operation This includes but is not limited to the following: — fire and gas detection and protection systems; — over-pressure and over-temperature protection systems; — remotely operated shut off equipment; — emergency shutdown system 10 Decommissioning and disposal 10.1 Decommissioning If the station is to be decommissioned, it shall be isolated from the main pipeline by closing and locking the station valves so that they cannot be opened accidentally It could also be necessary to use isolating blind flanges Specific precautions could be required if liquid hydrocarbons are contained in the pipework If major works are to be carried out on the station pipework, involving grinding, welding, drilling and any other potentially hazardous activities, the station pipework shall be purged to remove the gas; to avoid purging for minor works, specific procedures and equipment shall be applied If a section of the station is to be decommissioned the following safety measures shall be taken: a) the section shall be isolated from gas-carrying pipelines or other installations on the station The ends of the pipelines shall be effectively isolated; b) the section shall be purged to remove gas by an appropriate method 10.2 Disposal Compressor stations which are to be disposed shall be decommissioned as stated in 10.1 All the equipment should be removed Attention shall be given to safely isolate any external services into the station EXAMPLE These are considered as electrical power, water and drainage All work shall comply with the appropriate national and local environmental legislation 41 BS EN 12583:2014 EN 12583:2014 (E) Annex A (informative) Boundary of a gas compressor station Figure A.1 — Typical elements of a gas compressor station 42 BS EN 12583:2014 EN 12583:2014 (E) Figure A.2 — Control systems of a gas compressor station 43 BS EN 12583:2014 EN 12583:2014 (E) Annex B (informative) Parts of a gas compressor unit Figure B.1 — Parts of a gas compressor unit 44 BS EN 12583:2014 EN 12583:2014 (E) Annex C (informative) Boundary Gas compressor unit — Driver package * Parts not required for every kind of driver If these parts are installed they are to be considered as compressor unit auxiliaries Figure C.1 — Boundary gas compressor unit — Driver package 45 BS EN 12583:2014 EN 12583:2014 (E) Annex D (informative) Boundary Gas compressor unit — Gas compressor * Parts not required for every kind of driver If these parts are installed they are to be considered as compressor unit auxiliaries Figure D.1 — Boundary gas compressor unit — Gas compressor 46 BS EN 12583:2014 EN 12583:2014 (E) Annex E (informative) Boundary Gas compressor unit — Unit control system Not every compressor unit requires all the functions listed If these functions are installed, they are to be considered part of the unit control system Figure E.1 — Boundary gas compressor unit — unit control system 47 BS EN 12583:2014 EN 12583:2014 (E) Annex F (informative) Boundary Gas compressor unit — Auxiliary equipment * The marked items are considered part of the compressor unit only if they are installed inside the compressor unit Shut-off valves or are strictly related only to the considered compressor unit In case they are common for more than one compressor unit or are related to station equipment they are station auxiliaries Figure F.1 — Boundary gas compressor — Auxiliary equipment 48 BS EN 12583:2014 EN 12583:2014 (E) Annex G (informative) Significant technical changes between this European Standard and the previous edition Table G.1 — Significant technical changes between this European Standard and the previous edition Clause/Paragraph/ Table/Figure Change Clause Further exclusions from the scope specified: - installations downstream of the point of custody transfer and - design and construction of driver packages Clause The requirement of a safety management system and a pipeline integrity management system for the operator was added with a reference to EN 16348 Clause The requirement of an asset management system was added Clause New requirements with regard to environment protection were added 7.1 In order to ensure the security of supply of the gas transportation system, measures to increase the availability are listed 7.1.2.2 Requirements regarding the minimization of gas venting to the atmosphere were added 7.2.2.7 Requirements for electrical systems within the station boundary were reworded 7.2.2.9 A new clause dealing with the precautions against ignition of flammable substances on hot surfaces was added 7.3 The title of this clause was changed from “gas pipework” to “pipework” 7.3.1 The requirement for drains at low points of pipework where liquids could accumulate was added 7.3.11 A new clause was added with the recommendation that a standard colour painting code is necessary to distinguish different media 7.4.2 The chemical and physical condition of the fuel and process gas shall be agreed between the manufacturer of the driver and the occupier and shall be maintained during any operating conditions 7.4.2.3 The purging of the gas path of gas engines should not commence until the exhaust system has fallen below 450 °C 7.4.2.4 For electric motors a harmonics limitation systems shall be designed to comply with local regulations Additional design requirements for integrated electrical compressors added 7.4.3.2 Additional design requirements for integrated electrical compressors added 7.4.4.6 Details regarding the emergency shutdown system added 7.4.4.12 Clause “gas turbine flame protection system” was deleted 7.4.5.7 Setpoints of the gas alarm system for the compressor unit housing modified 49 BS EN 12583:2014 EN 12583:2014 (E) Clause/Paragraph/ Table/Figure Change 7.8.3 Details on purging of the station pipework and equipment during commissioning added 7.8.4 The as-build records shall include all risk assessments and details of all hazardous areas 8.3.2 Instructions for environmental impact precaution during normal operation modified with more details added 8.6.1 A new note was added regarding the prevention of gas explosion and fire for reciprocating engines and gas turbines 9.7.2 The safety precautions detailed in item e), g) h) are only required unless the area is proven to be safe and gas-free NOTE The technical changes referred include the significant changes from the revised EN; but is not an exhaustive list of all modifications from the previous version 50 BS EN 12583:2014 EN 12583:2014 (E) Bibliography [1] EN 1775, Gas supply — Gas pipework for buildings — Maximum operating pressure less than or equal to bar — Functional recommendations [2] EN 12327, Gas infrastructure — Pressure testing, commissioning and decommissioning procedures — Functional requirements [3] EN 13306:2010, Maintenance — Maintenance terminology [4] CEN/TR 13737-1 , Implementation Guide for functional standards prepared by CEN/TC 234 Gas infrastructure – Part 1: General [5] CEN/TR 13737-2 1), Implementation Guide for Functional Standards prepared by CEN/TC 234 Gas infrastructure - Part 2: National Pages related [6] EN 15001-1, Gas Infrastructure — Gas installation pipework with an operating pressure greater than 0,5 bar for industrial installations and greater than bar for industrial and non-industrial installations — Part 1: Detailed functional requirements for design, materials, construction, inspection and testing [7] EN 15001-2, Gas infrastructure — Gas installation pipework with an operating pressure greater than 0,5 bar for industrial installations and greater than bar for industrial and non-industrial installations — Part 2: Detailed functional requirements for commissioning, operation and maintenance [8] EN 16348, Gas infrastructure — Safety Management System (SMS) for gas transmission infrastructure and Pipeline Integrity Management System (PIMS) for gas transmission pipelines — Functional requirements [9] CEN/TR 16388, Gas-Specific Environmental Document — Guideline for incorporating within standards to minimize the environmental impact of gas infrastructure across the whole life cycle [10] EN 60079-0, Explosive atmospheres — Part 0: Equipment — General requirements (IEC 60079-0) [11] EN 62061, Safety of machinery — Functional safety of safety-related electrical, electronic and programmable electronic control systems (IEC 62061) [12] EN 62305 (all parts), Protection against lightning [13] EN ISO 1680, Acoustics — Test code for the measurement of airborne noise emitted by rotating electrical machines (ISO 1680) [14] EN ISO 9001, Quality management systems — Requirements (ISO 9001) [15] EN ISO 9004, Managing for the sustained success of an organization — A quality management approach (ISO 9004) [16] EN ISO 13631, Petroleum and natural gas industries — Packaged reciprocating gas compressors (ISO 13631) [17] EN ISO 14001, Environmental management systems — Requirements with guidance for use (ISO 14001) 1) Currently in preparation 51 BS EN 12583:2014 EN 12583:2014 (E) [18] EN ISO 50001, Energy management systems — Requirements with guidance for use (ISO 50001) [19] ISO 2314, Gas turbines — Acceptance tests [20] ISO 10494, Gas turbines and gas turbine sets — Measurement of emitted airborne noise — Engineering/survey method [21] ISO 11042-1, Gas turbines — Exhaust gas emission — Part 1: Measurement and evaluation [22] ISO 11042-2, Gas turbines — Exhaust gas emission — Part 2: Automated emission monitoring [23] ISO 21789, Gas turbine applications — Safety [24] DIRECTIVE 2006/42/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 17 May 2006 on machinery, and amending Directive 98/37/EC [25] DIRECTIVE 2009/73/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 13 July 2009 concerning common rules for the internal market in natural gas and repealing Directive 2003/55/EC [26] REGULATION (EC) No 715/2009 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 13 July 2009 on conditions for access to the natural gas transmission networks and repealing Regulation 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